SolarLiteracy

Massachusetts solar calculator

Try the solar math with your own assumptions.

Enter a monthly bill, rate, offset assumption, and optional project details. The output is a screening estimate designed to help you ask better questions.

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Education first Assumption-aware Built for homeowners

Illustrative MVP

Start with your assumptions

These inputs create a simple screening estimate. Replace the starting rate and assumptions with your own bill or proposal data.

Use a recent average, not a single unusual month.
Illustrative starting assumption. Edit it with your own rate.
This is a planning assumption, not a production guarantee.
Leave blank if you do not have a proposal.
If blank, the calculator estimates production as annual usage multiplied by your offset assumption.

Your illustrative output

What the inputs suggest

Approx. annual usage—
Approx. solar production—
First-year electricity value—
Rough annual savings estimate—

Assumptions used

  • Enter your bill and calculate to see the assumptions.

Estimates are illustrative and are not a solar proposal, utility quote, tax calculation, or guarantee of future savings.

How to use the result

Use the output to improve your questions

The calculator estimates annual usage from your bill and rate, then estimates production from your offset assumption unless you provide expected annual production. It multiplies that production by the rate you entered to show a rough first-year electricity value.

That value is not the same as a utility bill guarantee, net-metering credit, tax benefit, or full project return. Compare it with a site-specific proposal, then ask which assumptions are documented and which are illustrative.

Review what determines solar cost

Ready to compare real project options?

The calculator is a starting point. A proposal should make scope, production, ownership, financing, and current program assumptions visible.

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